Application of light-emitting diodes in bioreactors: Flashing light effects and energy economy in algal culture (Chlorella pyrenoidosa)

1996 ◽  
Vol 50 (1) ◽  
pp. 98-107 ◽  
Author(s):  
Hans C. P. Matthijs ◽  
Hans Balke ◽  
Udo M. van Hes ◽  
Bernd M. A. Kroon ◽  
Luuc R. Mur ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Chlorella Pyrenoidosa ◽  
Algal Culture ◽  
Light Emitting ◽  
Energy Economy ◽  
Light Effects ◽  
Flashing Light

Effect of flashing light from blue light emitting diodes on cell growth and astaxanthin production of Haematococcus pluvialis

2006 ◽  
Vol 102 (5) ◽  
pp. 442-446 ◽  
Author(s):  
Tomohisa Katsuda ◽  
Kazumichi Shimahara ◽  
Hironori Shiraishi ◽  
Keisuke Yamagami ◽  
Reza Ranjbar ◽  
...  
Keyword(s):  
Cell Growth ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Haematococcus Pluvialis ◽  
Light Emitting ◽  
Astaxanthin Production ◽  
Flashing Light

Circadian tuning with metameric white light: Visual and non-visual aspects

2020 ◽  
pp. 147715352097693
Author(s):  
T Aderneuer ◽  
O Stefani ◽  
O Fernández ◽  
C Cajochen ◽  
R Ferrini
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Stimulus ◽  
Light Emitting Diode ◽  
Biological Effects ◽  
Theoretical Models ◽  
Light Emitting ◽  
Single Colour ◽  
Light Effects ◽  
New Research

The growing awareness of the biological effects of electric light on humans has stimulated ample research. New research has been devoted to lighting solutions that dynamically change their colour to mimic spectral changes of daylight. However, in some situations, the visual properties of light must be preserved, such as when working under standardised lighting conditions to do colour correction in post-production. We have investigated the possibility to tune circadian effects using white lights that are spectrally different but nonetheless appear as a similar white tone. Our simulation results, for example, sets of light-emitting diodes, indicate that it is possible to modulate circadian light effects from 0.20 to 0.41 circadian stimulus by combining light-emitting diodes to create neutral white (4000 K) light. However, the results also show that the solutions combining single-colour light-emitting diodes leading to similar range between maximum and minimum circadian stimulus (ΔCS > 0.20) have a CRI below 80. Combining narrowband light-emitting diodes with a broadband white light-emitting diode improves the colour-rendering quality, and we show how far circadian light effects can be tuned according to common theoretical models. The aim is to maintain the natural cycle of melatonin levels as much as possible with high light stimulus in the morning and low light stimulus in the evening. Therefore, we show what maximum and minimum circadian effects are possible with a given set of light-emitting diodes.

scholarly journals Simplified estimation of the eye’s response to flashing light-emitting diodes

2015 ◽  
Vol 20 (6) ◽  
pp. 065005
Author(s):  
Adam T. Roberts ◽  
Stephanie K. Medley ◽  
Don A. Gregory ◽  
Nilesh B. Dhote
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Flashing Light

Visibility aid cycling clothing: flashing light-emitting diode (FLED) configurations

2015 ◽  
Vol 27 (3) ◽  
pp. 460-471 ◽  
Author(s):  
Helen S. Koo ◽  
Xiao Huang
Keyword(s):  
Design Methodology ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Content Type ◽  
Light Emitting ◽  
Flashing Light ◽  
Psychological Perceptions ◽  
Detection And Recognition

Purpose – The purpose of this paper is to investigate drivers’ differing psychological perceptions of cyclists’ conspicuity according to active visibility aid configurations on clothing. Design/methodology/approach – The flashing light-emitting diodes (FLEDs) were positioned on the major joints (shoulders, elbows, wrists, hips, knees, and ankles) in eight configurations and pre- and post-surveys were conducted. Findings – The results indicated that there were significant differences among the eight configurations in observers’ detection and recognition of cyclists, contributions of FLEDs, and visibility of cyclists (p<0.001). Among the eight different configurations on joints, FLEDs on the hips, knees, and ankles were the most detectable, recognizable, and visible. Originality/value – Most of the previous studies have investigated passive visibility aids and there is a lack of research on FLED configurations on major joints for cyclists. Thus, this study is expected to be beneficial to designers when developing active visibility aid clothing for cyclists.

Headset with flashing light emitting diodes

2008 ◽  
Vol 123 (6) ◽  
pp. 4033
Author(s):  
Douglas J. Andrea ◽  
Qunsheng Liu
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Flashing Light
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